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. Antipsychotic drugs may increase serum prolactin levels. This effect is the strongest in patients treated with risperidone and amisulpride.Aim. This paper (1) presents a case report of an active pituitary macroadenoma diagnosed in a patient receiving a long-term olanzapine treatment; and (2) discusses its practical therapeutic implications based on the literature review.Case report. A 28-year-old male patient had been treated with olanzapine for paranoid schizophrenia since 2008. In December 2016, an unsuccessful attempt to discontinue the drug was made as the patient had been in remission for the past few years. The attempt ended in March 2017 with psychiatric hospitalisation. MRI of the head and a prolactin test revealed a pituitary macroadenoma. The medication was changed from olanzapine to aripiprazole, but the patient’s mental status deteriorated. Ziprasidone was initiated, which resulted in symptomatic remission. The MRI scans of the head that were made in the following months showed no tumour progression. As prolactin levels were stably high, the patient received quinagolide therapy. In addition, small doses of clozapine and psychotherapy were added to the ongoing treatment.Conclusions. The present case report shows that (1) routine imaging tests should be performed as part of the diagnostic procedure in first-episode psychosis; (2) prolactin levels should be measured both before and during therapy; and (3) early and close interdisciplinary cooperation is needed to develop common therapeutic recommendations that could be applied in difficult and non-typical clinical cases, such as the one described herein.

The coexistence of pituitary macroadenoma and schizophrenia – practical therapeutic implications based on the case report and the literature review